Kedharnath, S., and R. P. Dhaundiyal. “Preliminary Observations on Air Layering in <I>Pinus Roxburghii< I> And <I>P. Caribaea< I>”;. Indian Forester, vol. 89, no. 3, Mar. 1963, pp. 218-21, doi:10.36808/if/1963/v89i3/24866.